Forests are essential to combating climate change. They drink up huge amounts of planet-heating carbon from the atmosphere and provide shelter for species struggling to adapt to global warming. For that reason, experts have called for measures to protect forests. But what about trees in cites? We hear much less…

The bellísimo beaches of southeastern Italy feature golden sand and azure waters—but even on a midsummer’s day, you won’t find many people. The reason: Just offshore, thousands of stinging jellyfish bob in the waves. Savvy locals warn visitors not to wade in too deep or put their heads underwater. “If…